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Dissertations / Theses on the topic 'Phenol Oxidas'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Burton, Stephanie Gail. "Biocatalytic and biomimetic studies of polyphenol oxidase." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1004088.

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Mushroom polyphenol oxidase (EC 1.14.18.1) was investigated to determine its potential for application as a biocatalyst in the synthesis of o-quinones, in organic medium. In order to determine the kinetic properties of the biocatalyst, a system was devised which comprised an immobilised polyphenol oxidase extract, functioning in chloroform. The system was hydrated by the addition of buffer. A simple method for the consistent measurement of reaction rates in this heterogenous system was designed and used to obtain detailed enzyme kinetic data relating to optimisation of reaction conditions and

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2

Avci, Gulden. "Analysis Of Phenol Oxidation Products By Scytalidium Thermophilum Bifunctional Catalase/phenol Oxidase (catpo)." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613770/index.pdf.

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This thesis was aimed to analyze phenol oxidation by the bifunctional catalase/phenol oxidase of the thermophilic fungus Scytalidium thermophilum. Several reactive oxygen species (ROS) are continuously produced in fungi under oxidative stress. Depending on the nature of the ROS species, some are highly toxic and are rapidly detoxified by various cellular enzymatic mechanisms, including the production of catalase. S. thermophilum produces a novel bifunctional catalase-phenol oxidase (CATPO) which is capable of oxidizing phenolics in the absence of hydrogen peroxide. Phenol oxidases convert phen

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3

Korkmaz, Erdural Beril. "Morphine Biotransformation By Microbial Phenol Oxidases." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12607014/index.pdf.

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ABSTRACT MORPHINE BIOTRANSFORMATIONS BY MICROBIAL PHENOL OXIDASES Erdural Korkmaz, Beril M.S., Department of Chemical Engineering Supervisor: Prof. Dr. Ufuk Bakir Co-Supervisor: Prof. Dr. Ayhan S. Demir January 2006, 96 pages The objective of this study is to perform morphine biotransformation by using phenol oxidases. Syctalidium thermophilum, Thermomyces lanuginosus and Phanerochaete chrysosporium cells and culture fluid were used as microbial intracellular and extracellular phenol oxidases. Besides the phenol oxidases produced in laboratory, commercial pure phenol oxidases, A.

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4

Bao, Haihong. "Biocatalysis of tyrosinase in organic solvent media using phenolic substrate models." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ50716.pdf.

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5

Erturk, Bedriye Durhan. "Determination Of Phenolics Concentration Using Cross-linked Phenol Oxidase Aggregates." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609647/index.pdf.

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The main object of the presented study was investigation of the use of cross-linked enzyme (tyrosinase) aggregates (CLTA) obtained from crude mushroom extract for a rapid phenolic content analysis in wines. In addition, a comparison of phenolic characteristics of Turkish red wines was performed. Reproducible and reliable results in total phenolic measurement were obtained with CLTAs similar to pure tyrosinase and tyrosinase obtained from crude mushroom extract. Measurement of total phenolic content is possible both in standard solutions and in complex matrices, such as wine. In a very short ti

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6

Kaptan, Yelda. "Utilization Of Scytalidium Thermophilum Phenol Oxidase In Bioorganic Synthesis." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605353/index.pdf.

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ABSTRACT UTILIZATION OF SCYTALIDIUM THERMOPHILUM PHENOL OXIDASE IN BIOORGANIC SYNTHESES Kaptan, Yelda M.S., Department of Biotechnology Supervisor: Prof. Dr. Z&uuml<br>mr&uuml<br>t B. &Ouml<br>gel Co-supervisor: Prof Dr. Ufuk Bakir September 2004, 90 pages In this study, the ultimate aim was to utilize phenol oxidases of Scytalidium thermophilum in bioorganic syntheses. For this purpose, studies were conducted towards enhancing the production of phenol oxidases by Scytalidium thermophilum, developing a suitable method for laccase activity assays, analyzing the effects of organic so

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7

Chanton, Patrick. "Calibration of phenol oxidase measurement in acidic wetland environments." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52329.

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Phenol oxidases mediate the degradation of recalcitrant compounds, polyphenolics, in wetland soils and are considered to play a key role in the microbial carbon cycle of peatlands which predominate in boreal biomes. In order to validate a method for quantification of oxidative enzyme activity in acidic wetland environments, the relationship between pH and substrate oxidation was studied using the standard enzyme tyrosinase and in soils collected from six freshwater wetlands including three marshes in north Florida and peatlands of northern Minnesota. Phenol oxidase (PO) activity was quantified

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8

Ncanana, Sandile Welcome. "Biocatalytic studies of phenol oxidases producing antioxidants." Doctoral thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5429.

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Includes bibliographical references (leaves 172-198).<br>In recent years there has been increasing interest in the production of oligomers and polymers of economic importance using biocatalysts; the application of enzymes in dimerisation or polymerisation processes can lead to the synthesis of unique compounds, with novel properties, that could not be easily achieved by conventional methods. Further, the application of biocatalysts in polymerization processes can be exploited in development of bioremediation systems, and there is a demand for new technologies that can be utilized in the remova

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9

Makgae, Mosidi Elizabeth. "Environmental electrochemistry of organic compounds at metal oxide electrodes." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49947.

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Dissertation (PhD)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: This study investigates the electrochemical oxidation of phenol. Phenol is a major toxin and water pollutant. In addition, during water treatment it reacts with chlorine to produce carcinogenic chlorophenols. lts treatment down to trace levels is therefore of increasing concern. For this purpose, dynamically stable anodes for the breakdown of phenols to carbon dioxide or other less harmful substances were developed and characterized. The anodes were prepared from mixed oxides of tin (Sn) and the precious metals ruthe

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10

Yuzugullu, Yonca. "Functional And Structural Analysis Of Catalase-phenol Oxidase From Scytalidium Thermophilum." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611463/index.pdf.

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Scytalidium thermophilum produces a novel phenol oxidase, which has turned out to be a bifunctional catalase-phenol oxidase (CATPO) during the course of this work, by other researchers of our group. Therefore, in the beginning of the studies, substrate specificity and inhibitor assays were conducted on the crude enzyme, followed by production, purification, cloning, expression, and mutagenesis and crystallography studies for further functional and structural analysis of CATPO. Accordingly, substrate specificity and inhibitory tests applied for crude enzyme characterisation presented the simila

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11

Zheng, Zongping, and 郑宗平. "Isolation and structural elucidation of tyrosinase inhibitors from five plant extracts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45700072.

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12

Anilkumar, P. "Studies on the enzyme phenol oxidase in Penaeus indicus H. Milne Edwards." Thesis, Central Marine Fisheries Research Institute, 1992. http://eprints.cmfri.org.in/11030/1/Anil%20kumar%20P.pdf.

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Modern aquaculture is a new science and industry although traditional in origin. In the past fifteen years aquaculture production shows a steady increase from 5 million m etric tonnes (1973) to 14.5 million metric tonnes (1988). In future an increase in the population coupled with an increase in percapita consumption will definitely culminate in the intensified effort to increase aquaculture production. In this context prawns are very important as a candidate species for culture and foreign exchange earner for a developing country like India. In order to achieve a reliable mechanism for produc

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13

Cong, Rongjuan Pelton Robert H. "PEO/poly(vinyl phenol-co-styrene sulfonate) aqueous complex formation /." *McMaster only, 2002.

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14

Selinheimo, Emilia. "Tyrosinase and laccase as novel crosslinking tools for food biopolymers /." [Espoo, Finland] : VTT, 2008. http://www.vtt.fi/inf/pdf/publications/2008/P693.pdf.

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15

Howitt, Christopher. "The direct partial oxidation of benzene to phenol on oxide catalysts." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317618.

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16

Rincon, Guillermo J. "Photocatalytic Mineralization of Phenol on Fluidized Titanium Oxide-Coated Silica Gel." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2009.

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A bench-scale tubular reactor with recirculation was built in order to study the efficiency of the photocatalytic oxidation of phenol on fluidized titanium oxide-coated silica gel beads. A UV-C lamp placed along the central vertical axes of the reactor was used as source of photons. A bed of silica gel beads was fluidized by means of fluid recirculation and forced to follow upward helical flow around the lamp. Anatase was successfully synthetized on silica gel particles of average diameters 224, 357 and 461 µm, as confirmed by scanning electron micrographs, through a sol-gel technique using a

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17

Ercin, Hatice Ozlem. "Cloning Of The Scytalidium Thermophilum Bifunctional Catalase / Phenol Oxidase Gene And Expression In Aspergillus Sojae." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609337/index.pdf.

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Scytalidium thermophilum is a thermophilic fungus with an important role in the composting process of mushroom cultivation. An extracellular phenol oxidase of Scytalidium thermophilum (STEP) with novel features was previously studied in our laboratory. This enzyme later turned out to be a catalase having phenol oxidase activity. The aim of this study was to clone Scytalidium thermophilum bifunctional catalase/phenol oxidase encoding gene and express the gene in Aspergillus sojae for future site directed mutagenesis studies. Scytalidium thermophilum catalase gene was first cloned into E. col

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18

Hoffmann, Eric. "The oxidative coupling of phenols using stoichiometric metal oxidants." Thesis, Nelson Mandela Metropolitan University, 2005. http://hdl.handle.net/10948/180.

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The oxidative coupling of 2,6-di-t-butylphenol under mild reaction conditions is well documented and the subject of many patents. However, the coupling of other monoand di- substituted phenols is not as well documented and thus there is scope for further investigation for providing a convenient, environmentally friendly and economically viable method for the oxidative coupling of these phenols. In this study, the oxidative coupling of a variety of alkylated phenolic substrates, 2-tbutylphenol, 2,6-di-t-butylphenol, 2,4 -di-t-butylphenol and ,4-dimethylphenol, using a range of different oxidizi

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19

Boshoff, Aileen. "The biotransformation of phenolic pollutants using polyphenol oxidase." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1004035.

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The potential of using mushroom polyphenol oxidase (EC 1.14.18.1) as a biocatalyst for the biotransformation of phenols to produce catechols in an aqueous medium was investigated. Polyphenol oxidase is characterised by two distinct reactions i.e., the ortho-hydroxylation of phenols to catechols (cresolase activity) and the subsequent oxidation of catechols to orthoquinones (catecholase activity). In order to facilitate the development of a process to produce catechols, the accumulation of catechol as a true intermediate product released in the reaction system needed to be investigated, as its

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20

Bérubé, Esther. "The production of phenol oxidases by white-rot fungi in submerged liquid culture /." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79999.

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Three species of white-rot fungi, Phlebia radiata, Phanerochaete chrysosporium, and Trametes versicolor, were monitored for laccase and lignin peroxidase production in a defined medium. P. radiata was selected for fed-batch reactor experiments due to its early laccase production, which was determined to be growth-associated. A second peak in laccase activity was observed after several days of nutrient deprivation and was attributed to autolysis of the culture. The effect of protease activity on the accumulation of extracellular laccase activity differed during primary and secondary meta

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21

Tse, Mara. "Biocatalysis of tyrosinase in chloroform medium using selected phenolic substrates." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27427.

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The biocatalytic activity of mushroom tyrosinase was optimized in chloroform medium, using five selected phenolic substrates, including catechin (CT), vanillin (VA), chlorogenic acid (CA), p-aminophenol (pAP) and hydroquinone (HQ). The specific activity (SA) of tyrosinase determined as the change in absorbance at the selected wavelength per $ mu$g protein per sec ($ delta$A/$ mu$g protein/sec) in chloroform was much higher than that obtained in aqueous media. The optimal amount of enzymatic protein for tyrosinase biocatalysis in chloroform was found to be 44.0 mg protein/L for CT and VA, 31.6,

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22

Scherman, Patricia Ann (neé Goetch). "The microbial production of polyphenol oxidase enzyme systems and their application in the treatment of phenolic wastewaters." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1004108.

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Phenolic compounds are a group of organic chemicals present in the wastewaters of many synthetic industrial processes. Due to their extreme toxicity to man and animals, and deleterious impact on the environment, a range of techniques exist for the effective treatment and disposal of these pollutants. Biological degradation using microbial enzymes presents a valuable alternative to conventional wastewater treatment systems. This research was therefore initiated to investigate the polyphenol oxidase enzyme system and the feasibility of its application for effluent treatment and studies in organi

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23

Forgan, Ross Stewart. "Modification of phenolic oximes for copper extraction." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/2764.

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The thesis deals with the modification of salicylaldoxime-based reagents used in hydrometallurgical extraction, addressing rational ligand design to tune copper(II) extractant strengths and also the development of reagents which are capable of transporting transition metal salts. Chapter 1 reviews current solvent extractant technology for metal recovery, including the limited knowledge of the effect of substituents on extractive efficacy. Advances in leaching technology have led to systems wherein increases in process efficiency could be obtained using reagents which can transport both a trans

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24

Zhambakin, Dauren. "Investigation of the reactivity of metal oxide catalysts for the gas-phase phenol methylation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7298/.

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The gas-phase phenol methylation with methanol was investigated both from catalitic and spectroscopic point of view. In particular, the work focus on the behavior of metal oxide catalysts, like iron(III) vanadate and aluminum vanadate. Spectroscopic studies include: X-ray diffraction and Raman analysis for catalyst charactrerization; Diffuse reflectance infrared fourier transform spectroscopy and in-situ Infrared spectroscopy in vacuum for investigation of interactions between reactants and surface of catalysts.

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25

Soyler, Ulviye Betul. "Characterization And Analysis Of The Antioxidant Capacity Of Functional Phenolics Oxidized By Scytalidium Thermophilum Catalase Phenol Oxidase (catpo)." Thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615049/index.pdf.

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Scytalidium thermophilum is a termophilic fungus that effectively produces the extracellular enzyme catalase phenol oxidase (CATPO). The enzyme is distinct among catalases with its bifunctionality of oxidising phenolic compounds in the absence of H2O2. CATPO is capable of oxidizing catechol, chlorogenic acid, caffeic acid and catechin which are ortho &ndash<br>diphenolic compounds. Diphenolic compounds are known as strong antioxidants. Catalase is one of the important antioxidant enzymes. Therefore, in this thesis the effect of CATPO on the final antioxidant capacity of the oxidized products w

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26

Edwards, Wade. "Capillary membrane-immobilised polyphenol oxidase and the bioremediation of industrial phenolic effluent." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1008458.

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Waste-generating industrialisation is intrinsically associated with population and economic proliferation. This places considerable emphasis on South Africa's water shortage due to the integral relationship between population growth rate and infrastructure development. Of the various types of industry-generated effluents, those containing organic pollutants such as phenols are generally difficult to remediate. Much work has been reported in the literature on the use of enzymes for the removal of phenols from these waste-streams but little application of this bioremediation approach has reached

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27

Clarke, Jill. "The photocatalytic degradation of phenolic compounds." Thesis, Open University, 1998. http://oro.open.ac.uk/57738/.

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Semiconductor photocatalysis degrades phenolic pollutants to carbon dioxide and water, but the mechanisms of this potentially attractive method of environmental remediation remain unclear. This study aimed to elucidate the primary molecular events by HPLC analysis of the initial products of degradation in water or aqueous acetonitrile. The position of substituents relative to the hydroxyl group were found to influence the reaction rate and also primary oxidation steps, and hence the intermediate profile. 2,6- Dialkylated phenols reacted fastest and showed high conversion to dehydrodimeric prod

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28

Udom, Innocent. "Investigation of Enhanced Titanium and Zinc Oxide Semiconductors for the Photodegradation of Aqueous Organic Compounds." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5596.

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Growing demand and shortages of potable water sources due to industrialization have become a great concern worldwide. Various approaches and solutions have been adopted to provide cleaner and quality water. In a preliminary study, a method of treating wastewater was investigated in which algae were used to remove nutrients (nitrogen and phosphorous) from wastewater and then the algae were harvested for use as a biofuel. The results from this investigation are included in the Appendix B. Employing traditional oxidants, such as hydrogen peroxide, chlorine, and ozone, for treatment of recalcitran

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29

Toberman, Hannah. "The response of extracellular phenol oxidase activity to environmental change, and the implications for the stability of soil carbon stores." Thesis, Bangor University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488843.

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30

Mmelesi, Olga Kelebogile. "Synthesis and characterization of pine cone carbon supported iron oxide catalyst for dye and phenol degradation." Thesis, Vaal University of Technology, 2017. http://hdl.handle.net/10352/418.

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M. Tech. (Department of Chemical Engineering, Faculty of Engineering and Technology), Vaal University of Technology<br>Fenton oxidation is classified into two processes, homogeneous and heterogeneous. Homogeneous Fenton oxidation process, have been shown to be efficient in the degradation of organic pollutants. However, it was shown to have limitations which can be addressed by the heterogeneous Fenton oxidation. Despite the high efficiency of the heterogeneous Fenton oxidation process in the degradation of recalcitrant organic pollutants, the currents synthesis trends of the heterogeneous Fen

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31

MASSA, ANDREA. "Development of manganese oxide films for the electro-oxidation of phenol at high temperature and pressure." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2675216.

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This thesis is divided into three main parts. In the first part, the concept of a MJ-PEM reactor will be introduced, and its design and calculations will be explained. A MJ-PEM reactor is the result of the coupling of a Multi-Junction Solar Cell (MJSC) and a Polymer Electrolyte Membrane (PEM) electrolyzer, able to work at high temperatures and pressures (up to 150°C and 30 bar). Two scenarios for the application of this system were investigated: in the first one, the anodic chamber is used for the oxidation of recalcitrant organics contained in wastewater, while the cathodic compartment is us

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32

SERRELI, GABRIELE. "Modulation of nitric oxide production by olive oil phenols and their metabolites." Doctoral thesis, Università degli Studi di Cagliari, 2018. http://hdl.handle.net/11584/255966.

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Nitric oxide (NO) is an important signaling molecule involved in many physiological and pathological processes. NO contributes to vessels vasodilatation and blood flow increasing, but also to the vessel homeostasis by inhibiting vascular smooth muscle contraction and growth, platelet aggregation, and leukocyte adhesion to the endothelium. In the intestinal epithelium, NO may play, at low levels, a protective role against the inflammatory process, while after acute or chronic exposure a toxic mechanism of action leads to injurious effects. Dietary polyphenols and their metabolites have been fou

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33

Harris, Dana N. "Quantitative structure activity relationships of monamine oxidase catalyzed oxidation of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine analogs." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/44451.

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Studies into the quantitative structure act! Vlty relationships of rate s of I-methyl-4-phenyl-l,2,3,6-tetrahydropyridine oxidation catalyzed by monoamine oxidases A and B were performed to elucidate active site substrate conformation and oxidation mechanisms. Plotting experimental kinetic activity against molecular properties obtained by experiment and by computational chemistry methods demonstrated correlations with lipophilic, steric, and electronic factors. Compounds studied were 4-aryloxy analogs, 4- aromatic heterocycle analogs, and 4-phenyl analogs. The conformer with phenyl ring to tet

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34

Nairn, Alison Kathleen. "Metal bound radicals in proteins : a biomimetic approach." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341097.

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35

Burton, Robert M. "Oxidant concentration effects in the hydroxylation of phenol over titanium-based zeolites Al-free Ti-Beta and TS-1." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2366.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2006.<br>This work focuses on the effects of hydrogen peroxide concentration on the catalytic activity and product selectivity in the liquid-phase hydroxylation of phenol over titanium-substituted zeolites Al-free Ti-Beta and TS-1 in water and methanol solvents. Hydroquinone is typically the desired product, and these solvents employed have previously been shown to be of importance in controlling the selectivity of this reaction. Different volumetric quantities of an aqueous 30 wt-% peroxide solution were added to either

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36

Skoglund, Maria. "Phenolic compounds in oats : effects of steeping, germination and related enzymes /." Uppsala : Dept. of Food Science, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200802.pdf.

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Pokrajac, Lisa A. "Fundamental studies of polyurethane - aluminum adhesion, phenyl isocyanate interaction with prepared aluminum oxide surfaces." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0006/MQ40733.pdf.

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38

Seemungal, Amanda B. A. "An assessment of the anti-oxidant and pro-oxidant profiles of red wine and selected phenolic components." Thesis, Kingston University, 2012. http://eprints.kingston.ac.uk/26278/.

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Introduction: Red wine contains a rich matrix of phenolic compounds which have been found to possess anti-oxidant properties. These phenolic anti-oxidants have considerable potential in preventing inflammation and oxidative stress. However, many of these dietary components can also exhibit pro-oxidant activity under certain experimental conditions, such as in the presence of redox-active transition metal ions. A great deal of research has focussed on the anti-oxidant potential of red wine. However, studies on the potential pro-oxidant effects are limited. Aims: This research aimed to contribut

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Pigatto, Gisele. "Estudo da aplicação da tirosinase vegetal no tratamento de efluentes e verificação da genotoxicidade do efluente tratado em células vegetais." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/9/9135/tde-10042013-164118/.

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Os problemas ambientais relacionados à crescente atividade industrial têm gerado preocupações aos órgãos governamentais e entidades de proteção ambientais, sendo necessários estudos de base que busquem novas alternativas para a recuperação de áreas poluídas e a solução de problemas operacionais relacionados com as técnicas empregadas. Um dos compostos mais encontrados em diversos efluentes industriais, principalmente de indústrias bioquímico-farmacêuticas, é o fenol que provoca um impacto danoso no ambiente devido ao fato de ser um poluente tóxico. O presente trabalho propõe, portanto, avaliar

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Holubcová, Petra. "Radikálové produkty oxidace vybraných typů fenolů a aminů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216416.

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In the framework of diploma thesis, radical products of the oxidation of selected paramethyl phenols and secondary amines were investigated. In the case of para-methyl phenols using EPR spectroscopy the reaction mechanism was proved, where the abstraction of hydrogen from para-methyl group is involved. In this way benzyl radicals are formed, which can be identified by spin-trapping technique using nitroso compounds. The adducts formed undergo the consecutive rearrangement, which leads to the formation of the corresponding nitrones. In addition to phenols, the radical products of the oxidation

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Ogunrombi, Modupe Olufunmilayo. "The synthesis and evaluation of 1-methyl-3-pyrrolines and 1-methylpyrroles as substrates and inhibitors of monoamine oxidase B / Modupe O. Ogunrombi." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1837.

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Very little is known about why and how the Parkinson's disease (PD) neurodegenerative process begins and progresses. In the course of developments for treatment of PD, the discovery of the inhibition of monoamine oxidase (MAO B) was a conceptual breakthrough, and has now been firmly established. MAO B has also been implicated in the neurodegenerative processes resulting from exposure to xenobiotic amines. For example, MAO B catalyzes the first step of the bioactivation of the parkinsonian inducing pro-neurotoxin, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Additional insight into the

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42

Stojanovic, Jelena. "Determination of polyphenol oxidase (PPO) activity, anthocyanin contents and the phytonutrient changes in blueberry juice as influenced by different processing methods." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-05292008-172900.

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43

Goetsch, Patricia-Ann. "The microbial production of polyphenol oxidase enzyme systems and their application in the treatment of phenolic wastewaters." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/6190.

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Phenolic compounds are a group of organic chemicals present in the wastewaters of many synthetic industrial processes. Due to their extreme toxicity to man and animals, and deleterious impact on the environment, a range of techniques exist for the effective treatment and disposal of these pollutants. Biological degradation using microbial enzymes presents a valuable alternative to conventional wastewater treatment systems. This research was therefore initiated to investigate the polyphenol oxidase enzyme system and the feasibility of its application for effluent treatment and studies in organi

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WANG, GAI. "Effect of Frozen Storage on Antioxidant Capacity, Polyphenol Oxidase Activity, and Phenolic and Flavonoid Content and Color of Pawpaw Pulp." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1373373703.

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Deng, Guodong. "Self-Assembly of Poly(Ethylene Oxide)-Block-Poly(Ethyl Acrylate)-Block-Polystyrene with Phenolic Resins." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399044329.

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Zhang, Zhenxian. "ASSESSMENT OF THE FEASIBILITY OF CO-ADMINISTRATION OF PHENOLIC DIETARY COMPOUNDS WITH PHENYLEPHRINE TO INCREASE ITS BIOAVAILABILITY." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/539.

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R-(-)-Phenylephrine (PE) is the most commonly used nonprescription oral nasal decongestant in the United States. It is a selective α1-adrenergic receptor agonist and has many years of safe usage. However, the efficacy of PE is controversial, due to its extensive pre-systemic metabolism, which leads to low and variable oral bioavailability (38 ± 9%, mean ± SD). Sulfation plays a very important role in pre-systemic metabolism of PE. The sulfation of PE occurs at its phenolic group, which is the preferred structural feature of many sulfotransferase (SULT) substrates. Compounds with phenolic group

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Ribeiro, Rita Sofia Garcia. "Estudos de biodegradação de fungicidas acilalanina por estirpes selecionadas de Zygomycetes." Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/15626.

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O principal objetivo deste trabalho consistiu em selecionar e avaliar diferentes estirpes de fungos Zygomycetes quanto à capacidade de degradação de fungicidas acilalaninas, nomeadamente o metalaxil e o metalaxil-M. Com vista à seleção dos fungos mais promissores na degradação dos fungicidas procedeu-se a um rastreio em meio sólido e as estirpes que mostraram maior capacidade para tolerar os fungicidas em estudo, foram selecionadas para avaliação do perfil de crescimento da biomassa, taxa de utilização da sacarose e taxa de degradação do metalaxil, em meio de cultura líquido. Foi ainda possíve

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Santiago, J?nior Aristides Felipe. "Oxida??o ?mida de fen?is com catalisadores de ferro suportado em argilominerais em reator de leito de lama (slurry)." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15904.

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Made available in DSpace on 2014-12-17T15:01:51Z (GMT). No. of bitstreams: 1 AristidesFSJ_TESE.pdf: 1616188 bytes, checksum: 162e291640cf71e1607267c17f431e17 (MD5) Previous issue date: 2010-10-15<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The wet oxidation of organic compounds with CO2 and H2O has been demonstrated to be an efficient technique for effluent treatment. This work focuses on the synthesis, characterization and catalytic performance of Fe-MnO2/CeO2, K-MnO2/CeO2/ palygorskite and Fe/ palygorskite toward the wet oxidative degradation of phenol. The experime

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Azevedo, Andreia Cristiane Souza. "Estudo das enzimas oxidativas e presença de compostos bioativos em mangas (Mangifera indica L.) produzidas no Brasil." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256708.

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Orientador: Glaucia Maria Pastore<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-05T16:35:23Z (GMT). No. of bitstreams: 1 Azevedo_AndreiaCristianeSouza_D.pdf: 1028995 bytes, checksum: 6758be8c224c65879df45396853361cf (MD5) Previous issue date: 2006<br>Resumo: Diversos estudos epidemiológicos têm mostrado que o consumo regular de frutas e vegetais reduz a incidência de doenças crônico-degenerativas. A manga (Mangifera indica L.) é amplamente encontrada em regiões tropicais e subtropicais, é uma fruta popular

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Lykourinou, Vasiliki. "Copper and iron complexes of linear and crosslinked polymers as catalysts for phosphoester hydrolysis and oxidative transformation of phenolic and catecholic substrates." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001845.

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